Oscillating fan



w In W Noir. 12, 1963 E. v. SUNDT OSCILLATING FAN Filed Feb. 14. 1958 3Sheets-Sheet 1 INVENTOR.

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Nov. 12, 1963 E. v. SUNDT OSCILLATING FAN 3 Sheets-Sheet 2 INVIEN'TOR.

Filed Feb. 14, 1958 iwmaauw Nov. 12 1963 E. v. SUNDT OSCILLATING FAN 3Sheets-Sheet 3 Filed Feb. 14, 1958 United States Patent 3,11%},829@SQILLATENG FAN Edward V. Sundt, i365 Miner Stu, Wilmette, Ill. FriedFeb. 14, 199553, Ser. No. 715,257 1?) Claims. (till. 31@68) Theprincipal object of this invention is to provide an improved oscillatingfan wherein all of the movable parts are enclosed within the motorhousing, wherein a differential speed reducer is concentrically arrangedwith respect o the fan propelling motor shaft to provide a simple andcompact construction, wherein the differential speed reducer operates tooscillate the motor housing at a desired reduced speed, and whereinoscillation of the motor housing may be started and stopped at will.

Further objects of this invention have to do with the details ofconstruction of the oscillating fan and the cooperative relationshipsbetween the component parts thereof.

Other objects and advantages of this invention will become apparent tothose skilled in the art upon reference to the accompanyingspecification, claims and drawings, in which:

PEG. 1 is a side elevatioual view of one form of the oscillating fan ofthis invention.

PEG. 2 is an enlarged vertical sectional view through the upper righthand portion of the oscillating fan illustrated in FIG. 1.

FlG. 3 is a vertical sectional View taken substantially along the line33 of FIG. 2.

FIG. 4 is a horizontal sectional view taken substantially along the line4-4 of FIG. 2.

FIG. 5 is a vertical sectional view taken substantially along the line5-5 of FIG. 2.

PEG. 6 is a vertical sectional along the line 6-6 of HG. 2.

F16. 7 is an enlarged vertical sectional View similar to PEG. 2 butillustrating another form of the oscillating fan of this invention.

PKG. 8 is a vertical sectional viev talcen substantially along the line3-8 of PEG. 7.

PEG. 9 is a vertical sectional view taken substantially along the line99 of FIG. 7.

H6. 10 is a vertical sectional view taken substantially along the linelid-dd of FIG. 7.

11 is a horizontal sectional view taken substantially along the linelillil of FIG. 8.

P18. 12 is a horizontal sectional view taken substantantially along theline 12l2 of H6. 8 and illustrating the control mechanism for theoscillating fan of PEG. 7.

13 is an end elcvatlonal view of the control mechanism illustrated inMG. 12.

PEG. 14 is a vertical sectional view taken substantially along the linel4l i of H6. 12.

15 is a view similar to FIG. 12 but illustrating the parts in positionfor causing oscillation of the fan, FIG. 12 showing the parts inposition for stopping operation of the fan.

llcfrring first to FIGS. 1 to 6, one form of the oscillatfan of thisinvention is generally designated at it it includes electric motor ofconventional construction having a field structure it :and an armature12 secured to a rotating shaft 13. The electric motor is enclosed withina motor housing formed of two parts 14 and 15 which are secured togetherat in by means of tiebolts 17. The motor housing parts 14 and 15 areprovided with hearing supports for supporting bearings 18 and 1.9 whichrotatably mount the shaft 13. T e shaft 13 projects beyond the housingpart 14 and carries the usual fan and operates to propel the fan whenthe electric motor is energized. The motor housing parts i4 and 1'5 maybe iew taken substantially L" I in the form of die-castings and thebearings 18 and 19 may comprise the usual oilless bearings.

The oscillating fan also includes a stationary support 22 which may bein the form of 'a formed steel stand. Arranged in the top of the stand22 are a pair of swivel members 25, which may be die-cast members, andarranged for swinging movement between the swivel members 23 is asupporting stud 2.4, the stud 24 being tiltably mounted in a verticalplane between the swivel members 23 by a screw 25 and not The bottom ofthe motor housing, at the mating joint 16, is provided with an oillessbearing member 23, the bearing member being secured in place when themotor housing par-ts are clamped together by the tic-bolts 17. Thisbearing member 28 is rotatably mounted on a cylindrical portion 27 ofthe supporting stud 2 and the parts are held in assembled relation by athrust ring 29, formed of powdered iron or the like, which is press fitonto the cylindrical portion 2'7. In this way, the mot-or housing isrotatably mounted on the supportin stud for substantially horizontaloscillation. At the same time, the supporting stud may be swung in avertical plane for tiltng the motor housing to a desired extent.Arranged within the motor housing and formed on the supporting stud, isa reaction member 3b.

A steel eccentric 3 2 is rigidly secured to the motor shaft by means ofserrations or splines .33 so as to rotate with the shaft. The eccentric32 may ride against a washer which acts as a thrust hearing for theshaft 13. totatably mounted on the eccentric 32 is an oscillating memberor rotor which may be formed of nylon or the like. The oscillatingmember 35 is provided with a first ring or teeth 36, there being, forpurposes of illustration, 18 teeth in the of teeth. The oscillatingmember 35 is also provided with a second ring of teeth 37, there being19 teeth in this ring of teeth.

Rotatably mounted in the housing part 15 is a gear member 39 havinginternal teeth as meshing with the first ring of teeth 36 on theoscillating member 35, the teeth iii being 19 in number. In order tooscillate the motor housing, the gear member 39 is held against rotationand this is accomplished by means of a cam 41 can ried by a shaft 42 ona knob 4-3. When the knob 43 is in one position, the cam 41 is free fromthe gear member 39 so that rotation of the gear member 39 is permitted.When, however, the knob 4-3 is moved to another position, the cam 41clamps the gear member 39 against the housing part 15' to secure thegear member 3? against rotation. The second ring of teeth 37 on theoscillating member 35 meshes with teeth 45 on a second gear member 46which is rotatably mounted on the shaft 13, the teeth 4-5 being 20 innumber. The second gear member 46 is provided with an eccentric 47 whichis arranged between a pair of fingers 45 which form a yoke on thereaction member 30.

Electrical energy is supplied to the electric motor through suitablewires under the control of an electric switch 51 arranged within thestationary support 22 and operated by a lever 52. When the switch 51 isturned on, the electric motor is operated to propel the fan 2%} and whenit is turned oif, the electric motor is stopped. The eccentric 32 drivenby the shaft 13 and the oscillating member 35, first gear member 3% andsecond gear memer 46 form a differential speed reducer which isconcentrically arranged about the shaft 13, this differential speedreducer operating, when the first gear member 39 is secured againstrotation, to rotate the eccentric 47 at 'a reduced speed. The eccentrict7 cooperates with the stationary yoke formed by the fingers 49 to causethe motor housing to oscillate substantially horizontally at reducedspeeds.

The formula for determining the speed reduction ratio between the secondgear member 46 and the eccentric 32 and hence the shaft 13 may beexpressed as follows:

where a, b, c and d, respectively are the numbers of teeth on the firstgear member 39, in the first ring 36 of teeth on the oscillating member35, in the second ring 37 of teeth on the oscillating member 35 and onthe second gear member 46. By substituting the appropriate values, asexpressed above, the speed reduction ratio becomes Various speedreduction ratios may be obtained by appropriately selecting desired gearratios between the first gear member 39, the oscillating member 35 andthe second gear member 46. Assuming that the motor shaft 13 is rotatedat a speed of substantially 1750 r.p.m., and with this speed reductionratio of 360 to 1, the eccentric 47 is rotated at a speed ofsubstantially rpm. so that the fan housing is oscillated substantially 5times per minute. Any time that it is desired to stop oscillation of themotor housing while the electric motor is oscillating, the knob 43 maybe manipulated to release the first gear member 39 and when this isdone, the first gear member 39 is allowed to rotate freely, thuspreventing rotation of the eccentric 47 by the second gear member 46.

The first gear member 39 may be formed of steel or the like andpreferably the second gear member 46 and eccentric 47 are formed ofpowered iron impregnated with a suitable lubricant for lubricating therunning surfaces including those between the shaft 13, the eccentric 47and the yoke fingers 49. The yoke member or reaction member 30 which isan extension of the supporting stud is preferably a die-cast part. Inthe form of the invention illustrated in FIGS. 1 to 6, it is possible toobtain easily, an angle of oscillation of substantially 45 de grees,this angle being limited by the relationships between the eccentric 47and the yoke fingers 49. 7

Another form of the oscillating fan of this invention is illustrated inFIGS. 7 to 15 and is generally designated at 55 therein. This form ofthe invention is very much like the form described above and likereference characters have been utilized for like parts. This form of theinvention differs from the other form of the invention in two essentialrespects, one, provision is made for providing an angle of oscillationof the motor housing up to 90 degrees, and two, a single actuator isutilized for starting and stopping operation of the electric motor andstarting and stopping oscillation of the motor housing. Theoscillatingfan of FIGS. 7 to 13 utilizes substantially the same motorconstruction, stationary support and differential speed reducer, and asexpressed above, like reference characters have been utilized for likeparts.

However, in the oscillating fan 55 of FIGS. 7 to 15 the reaction member30 does not itself carry the yoke. Instead, the reaction member 3tl isprovided with aplurality of beleved teeth 60 which are concentric withthe axis or" the supporting stud 24. A yoke 62 has beveled teeth 61which mesh with the teeth 60 on the reaction member 36 and the yoke 62is pivoted to the field structure of the electric motor by a springsleeve 64. The yoke 62 is provided with a central opening 63 whichreceives the eccentric 4'7 rotated by the second gear member 46. Thus,as the eccentric 47 is rotated at reduced speeds by the differentialspeed reducer, the pivoted yoke 62 is oscillated and reacts against thestationary reaction member 3% through the beveled gear teeth 60 and 61.The pivoted yoke 62, therefore, operates as a multiplying member forproviding substantially 90 degrees oscillation to the motor housing. Theupper end of the pivoted yoke 62 is provided with surfaces 65 whichcooperate with projections on the cam member 67 of the controlmechanismfor purposes hereinafter to be described.

The cam member 67 is arranged within the motor housing adjacent the topthereof and it is secured by a rivet 68 to a shank 69 on a knob 70. Thecam member 67 is promember 39 is released for rotation.

.vided with a cam surface 71 which is adapted to be moved from aposition illustrated in FIG. 10 where it is free from the first gearmember 39 to a position as illustrated in FIG. 15 where it engages thefirst gear member 39 to secure the same against rotation. A terminalblock 73 is secured to the motor housing part 15 adjacent the cam member67 by means of a spacer 74 and a rivet 75. This terminal block carries apair of terminals 76 and 77 provided with contacts 78 and 79. Theterminals 76 and 77 are connected in series with the electric motor sothat when the contacts 78 and 79 thereof are bridged, the motor isoperated and so that When the contacts 78 and 79 are disconnected,operation of the electric motor is stopped. The contacts '78 and 79 areselectively bridged by a contact strip 81 carried by the cam member 67,the contact strip being secured thereto by embedding the ends 82 thereofin the cam member 67.

When the parts are in the position illustrated in FIG. 12 the contactstrip 81 does not bridge the contacts 78 and 79 and, as a result, theelectric motor is deenergized. Also, the cam surface 71 is displacedfrom the first gear member 39 so that the first gear member 39 is notsecured against rotation. When the cam member 67 is moved to a positionintermediate the positions illustrated in 1 165.12 and 15, the contactstrip 81 bridges the contacts 78 and 79 to cause operation of theelectric motor and propelling of the fan. However, in this intermediateposition the cam surface 71 does not engage the first gear member 39 sothat the first gear member is not secured against rotation. Accordingly,the diiferential speed reducer is not operative to cause oscillation ofthe motor housing even though the fan is propelled. In this intermediateposition the fan may be placed in any desired position and run withoutoscillation.

When the cam member 67 is moved to the position illustrated in FIG. 15,the contacts 78 and 79 remain bridged by the contact strip 81 so thatthe electric motor continues in operation to propel the fan. In thisposition, the cam surface 71 engages the first gear member 39 to causethe diflerential speed reducer to operate to oscillate substantialyhorizontay the motor housing through substantially 90 degrees. Byrotating the cam member 67 from the position illustrated in FIG. 15 tothe position illustrated in FIG. 12 oscillation of the motor housing isinterrupted and operation of the electric motor is stopped.

If oscillation of the motor housing is stopped when it is at one end orthe other end of its oscillating movement, as illustrated in dottedlines in FIG. 8, the eccentric 47 would be on dead center with respectto theyoke 62 so thatit would be substantially impossible to manuallyposition the motor housing even though the first gear To prevent this,the cam member 67 is provided with a pair of projections 34 and whichcooperate with the top surface 65 of the pivoted yoke 62. When thepiovted yoke 62 is in either extreme position the top surface 65 of theyoke comes in alignment with one or the other projections 84 and $5 toprevent movement of the cam member 67 out of the position illustrated inFIG. 15. Under these condi- :tions, itvis impossible to stop operationof the motor.

Movement of the cam member 67'and stopping of the While for purposes ofillustration, two forms of this invention have been disclosed, otherforms thereof may become apparent to those skilled in the art uponreference to this disclosure and, therefore, this invention is to belimited only by the scope of the appended claims.

I claim as my invention:

1. In an oscillating fan, a motor housing, an electric motor in themotor housing and having a substantially horizontally arranged shaftrotated thereby for propelling the fan, a stationary support extendinginto the motor housing, means for rotatably mounting the motor housingon the support for substantially horizontal oscillation thereof, adifferential speed reducer in the motor housing concentric with themotor shaft and driven thereby, a stationary reaction member in themotor housing and secured to the support within the motor housing abovethe motor housing mounting means, and means in the motor housingconnecting the differential speed reducer to the reaction member forcausing the motor housing to oscillate substantially horizontally at areduced speed as the electric motor is operated, said last mentionedmeans including an eccentric driven by the diiierential speed reducerand a yoke encompassing said eccentric and connected with the reactionmember.

2. In an oscillating fan, a motor housing, an electric motor in themotor housing and having a substantially horizontally arranged shaftrotated thereby for propelling the fan, a stationary support extendinginto the motor housing, means (for rotatably mounting the motor housingon the support for substantially horizontal oscillation thereof, adifferential speed reducer in the motor housing concentric with themotor shaft and driven thereby, a stationary reaction member in themotor housing and secured to the support Within the motor housing abovethe motor housing mounting means, and means in the motor housingconnecting the dillerential speed reducer to the reaction member forcausing the motor housing to oscillate substantially horizontally at areduced speed as the electric motor is operated, said last mentionedmeans including an eccentric driven by the differential speed reducerand a yoke formed on the reaction member and encompassing saideccentric.

3. In an oscillating fan, a motor housing, an electric motor in themotor housing and having a substantially horizontally arranged shaftrotated thereby for propelling the fan, a stationary support extendinginto the motor housing, means for rotatably mounting the motor housingon the support for substantially horizontal oscillation thereof, adifferential speed reducer in the motor housing concentric with themotor shaft and driven thereby, a stationary reaction member in themotor housing and secured to the support within the motor housing abovethe motor housing mounting means, and means in the motor housingconnecting the differential speed reducer to the reaction member forcausing the motor housing to oscillate substantially horizontally at areduced speed as the electric motor is operated, said last mentionedmeans including an eccentric driven by the differential speed reducer, apivoted yoke encompassing the eccentric and oscillated thereby, and gearteeth connections between the pivoted yoke and the reaction member.

4. in an oscillating fan, a motor housing, an electric motor in themotor housing and having a substantially horizontally arranged shaft forpropelling the fan, a stationary support extending into the motorhousing, means for rotatably mounting the motor housing on the supportfor substantially horizontal oscillation, a differential speed reducerin the motor housing concentrically arranged about the shaft andincluding an eccentric rotated by the shaft, an oscillating memberrotatably mounted on the eccentric and including a pair of rings of teeh, a first gear meshing With one ring of teeth on the oscillating memberfor controlling the oscillating member, means for securing the firstgear member against rotation and a second gear meshing with the otherring of teeth on 6 the oscillating member and rotated thereby at reducedspeed when the first gear member is secured against rotation, astationary reaction member Within the motor housing and secured to toesupport within the motor housing above the motor housing mounting means,and means Within the motor housing connecting the second gear to thereaction member for causing the motor to oscillate substantiallyhorizontally at a reduced speed as the electric motor is operated,

. In an oscillating fan, a motor housing, an electric motor in the motorhousing and having a substantially horizontally arranged shaft forpropelling the fan, a stationary support extending into the motorhousing, means for rotatably mounting the motor housing on the supportfor substantially horizontal oscillation, a differential speed reducerin the motor housing concentrically arranged about the shaft andincluding an eccentric rotated by the shaft, an oscillating memberrotatably mounted on the eccentric and including a pair of rings ofteeth, a first gear meshing With one ring of teeth on the oscillatingmember for controlling the oscillating member, means for securing thefirst gear member against rotation, and a second gear meshing with theother ring of teeth on the oscillating member and rotated thereby atreduced speed when the first gear member is secured against rotation, astationary reaction member within the motor housing and secured to thesupport within the motor housing above the motor housing mounting means,and means Within the motor housing connecting the second gear to thereaction member for causing the motor to oscillate substantiallyhorizontally at a reduced speed as the electric motor is operated, saidlast mentioned means including an eccentric driven by the second gearand a yoke encompassing said eccentric and connected with the reactionmember.

6. In an oscillating fan, a motor housing, an electric motor in themotor housing and having a substantially horizontally arranged shaft forpropelling the fan, a stationary support extending into the motorhousing, means for rotatably mounting the motor housing on the supportfor substantially horizontal oscil ation, a differential speed reducerin the motor housing concentrically arranged about the shaft andincluding an eccentric rotated by the shaft, an oscillating memberrotatably mounted on the eccentric and including a pair of rings ofteeth, a first gear meshing with one ring of teeth on the oscillatingmember for controlling the oscillating member, means for securing thefirst gear member against rotation, and a second gear meshing with theother ring of teeth on the oscillating member and rotated thereby atreduced speed when the first gear member is secured against rotation, astationary reaction member within the motor housing and secured to thesupnort Within the motor housing above the motor housing mounting means,and means within the motor housing connecting the second gear to thereaction member for causing the motor to oscillate substantiallyhorizontally at a reduced speed as the electric motor is operated, saidlast mentioned means including an eccentric driven by the second gearand a yoke formed on the reaction member and encompassing saideccentric.

7. In an oscillating fan, a motor housing, and electric motor in themotor housing and having a substantially horizontally arrange shaft forpropelling the fan, a stationary support, means for rotatably mountingthe motor housing on the support for substantially horizontaloscillation, a differential speed reducer in the motor housingconcentrically arranged about the shaft and including an eccentricrotated by the shaft, an oscillating member rotatably mounted on theeccentric and including a pair of ngs of teeth, a first gear meshingwith one ring f teeth on the oscillating member for controlling theoscillating member, means for securing the first gear member againstrotation, and a second gear meshing with the other ring of teeth on theoscillating member and rotated thereby at reduced speed when the firstgear member is secured against rotation, a stationary reaction memberwithin the motor housing and secured to the support within the motorhousing above the motor housing mounting means, and means within themotor housing connecting the second gear to the reaction member forcausing the motor to oscillate substantially horizontally at a reducedspeed as the electric motor is operated, said last mentioned meansincluding an eccentric driven by the second gear, a pivoted yokeencompassing the eccentric and oscillated thereby, and gear teethconnections between the pivoted yoke and the reaction member.

8. In an oscillating fan, a motor housing, an electric motor in themotor housing and having a substantially horizontally arranged shaftrotated thereby for propelling the fan, a manually operated switchcarried by the motor housing and connected to the electric motor forcontrolling the operation of the same, a stationary support, means forrotatably mounting the motor housing on the support for substantiallyhorizontal oscillation thereof, a differential speed reducer in themotor housing concentric with the motor shaft and driven thereby, acontrol device for selectively rendering the differential speed reduceroperative and inoperative, means interconnecting the manually operatedswitch and the control device (for rendering the difierential speedreducer operative only when the electric motor is operating, astationary reaction member in the motor housing and secured to thesupport, and means in the motor housing connecting the differentialspeed reducer to the reaction member for causing the motor housing tooscillate substantially horizontally at a reduced speed when the speedreducer is rendered operative.

9. In an oscillating fan, an electric motor having a substantiallyhorizontally arranged shaft for propelling the fan, a manually operatedswitch connected to the electric motor for controlling the operation ofthe same, a stationary support, means for rotatably mounting the motoron the support for substantially horizontal osciliation, a dilferentialspeed reducer concentrically arranged about the shaft and including aneccentric rotated by the shaft, an oscillating member rotatably mountedon the eccentric and including a pair of rings of teeth, a first gearmeshing with one ring of teeth on the oscillating memher for controllingthe oscillating member, a control device for selectively securing thefirst gear against rotation, means interconnecting the manually operatedswitch and the control device for securing the first gear againstrotation only when the electric motor is operating, a second gearmeshing with the other ring of teeth on the oscillating member androtated thereby at reduced speed when the first gear member is securedagainst rotation, at reaction member secured to the support, and meansconnecting the second gear to the reaction member for causing the motorto oscillate substantially horizontally at a reduced, speed when thefirst gear is secured against rotation.

10. In an oscillating fan, on electric motor having a substantiallyhorizontally arranged shaft for propelling the fan, a manually operatedswitch connected to the electric motor for controlling the operation ofthe same, a stationary support, means for rotatably mounting the motoron the support for substantially horizontal oscillation, a differentialspeed reducer concentrically arranged about the shaft and including aneccentric rotated by the shaft, an oscillating member rotatably mountedon the eccentric and including a pair of rings of teeth, a first gearmeshing with one ring of teeth on the oscillating :member forcontrolling the oscillating member, a control device for selectivelysecuring the first gear against rotation, means interconnecting themanually operated switch and the control device for securing the firstgear against Erotation only when the electric motor is operating, asecond gear meshing with the other ring of teeth on the osyillatingmember and rotated thereby at reduced speed when the first gear memberis secured against rotation, an eccentric driven by the second gear, ayoke associated with the stationary support and encompasizsng theeccentric for causing the motor to oscillate substantially horizontallyat a reduced speed when the first gear is secured against rotation, andmeans associated with the manually operated switch and the yoke toprevent manual operation of the switch to stop operation of the motorwhen the motor is in an end position of its substantially horizontaloscillation.

11. In an oscillating fan, a motor housing, an electric motor in themotor housing and having a substantially horizontally arranged shaftrotated thereby for propelling the fan, a manually operated switchcarried by the motor housing and connected to the electric motor forcontrolling the operation of the same, a stationary support, means forrotatably mounting the motor housing on the support for substantiallyhorizontal oscillation thereof, a differential speed reducer in themotor housing concentrio with the motor shaft and driven thereby, acontrol device for selectively rendering the differential speed reduceroperative and inoperative, means interconnecting the manually operatedswitch and the control device for rendering the differential speedreducer operative only when the electric motor is operating, astationary reaction member in the motor housing and secured to thesupport, and means in the motor housingconnecting the differential speedreducer to the reaction member for causing the motor housing tooscillate substantially horizontally at a reduced speed when the speedreducer is rendered operative, and means associated with the manuallyoperated switch and the last mentioned means to prevent manual operationof the swicth to stop operation of the motor when the motor housing isin an end position of its substantially horizontal oscillation. j

12. In an oscillating fan, an electric motor having a substantiallyhorizontally arranged shaft for propelling the fan, a manually operatedswitch connected to the electric motor for controlling the operation ofthe same, a stationary support, means for rotatably mounting the motoron the support for substantially horizontal oscillation, a differentialspeed reducer concentrically arranged about the shaft and including aneccentric rotated by the shaft, an oscillating member rotatably mountedon the eccentric and including a pair of rings of teeth, a first gearmeshing with one ring of teeth on the oscillating member for controllingthe oscillating member, a control device for selectively securing thefirst gear against rotation, means interconnecting the manually operatedswitch and the control device for securing the first gear againstrotation only when the electric motor is operating, a second gearmeshing with the other ring of teeth on the oscillating member androtated thereby at reduced speed when the first gear member is securedagainst rotation, a reaction member secured to the support, and meansconnecting the second gear to the reaction member for causing the motorto oscillate substantially horizontally at a reduced speed when thefirst gear is secured against rotation, and means associated with themanually operated switch and the last mentioned means to preventmanual'operation of the switch to stop operation of the motor when themotor is in an end position of its substantially horizontal oscillation.

13. In an oscillating fan, a motor housing, an electric motor in themotor housing and having a field structure carried by the housing, anarmature in the field structure, and a substantially horizontal shaftcarrying the armature and rotated thereby for propelling the fan, a pairof bearings in the motor housing for rotatably mounting the shaft, amanually operated switch carried by the motor housing and connected tothe electric motor for control ling the operation of the same, adifferential speed reducer in the motor housing concentric with andsupported by the motor shaft and driven thereby, a stationary support,means for rotatably mounting the motor housing onjthe support forsubstantially horizontal oscillating thereof, a stationary reactionmember in the motor housing and secured to the support, and means in themotor housing connecting the difierential speed reducer to the reactionmember for causing the motor housing to oscillate substantially at areduced speed as the electric motor is operated, and means associatedwith the manually operated switch and the last mentioned means toprevent manual operation of the switch to stop operation of the motorwhen the motor housing is in an end position of its substantiallyhorizontal oscillation.

References Cited in the file of this patent UNITED STATES PATENTS EckFeb. 9, 1904 Becker June 8, 1909 Shedd Aug. 8, 1911 Stowe Apr. 8, 1913Stuart May 8, 1928 London Aug. 17, 1920 Schneider Nov. 29, 1927 AppleApr. 7, 1931 Greenberg May 28, 1935

1. IN AN OSCILLATING FAN, A MOTOR HOUSING, AN ELECTRIC MOTOR IN THEMOTOR HOUSING AND HAVING A SUBSTANTIALLY HORIZONTALLY ARRANGED SHAFTROTATED THEREBY FOR PROPELLING THE FAN, A STATIONARY SUPPORT EXTENDINGINTO THE MOTOR HOUSING, MEANS FOR ROTATABLY MOUNTING THE MOTOR HOUSINGON THE SUPPORT FOR SUBSTANTIALLY HORIZONTAL OSCILLATION THEREOF, ADIFFERENTIAL SPEED REDUCER IN THE MOTOR HOUSING CONCENTRIC WITH THEMOTOR SHAFT AND DRIVEN THEREBY, A STATIONARY REACTION MEMBER IN THEMOTOR HOUSING AND SECURED TO THE SUPPORT WITHIN THE MOTOR HOUSING ABOVETHE MOTOR HOUSING MOUNTING MEANS, AND MEANS IN THE MOTOR HOUSINGCONNECTING THE DIFFERENTIAL SPEED REDUCER TO THE REACTION MEMBER FORCAUSING THE MOTOR HOUSING TO OSCILLATE SUBSTANTIALLY HORIZONTALLY AT AREDUCED SPEED AS THE ELECTRIC MOTOR IS OPERATED, SAID LAST MENTIONEDMEANS INCLUDING AN ECCENTRIC DRIVEN BY THE DIFFERENTIAL SPEED REDUCERAND A YOKE ENCOMPASSING SAID ECCENTRIC AND CONNECTED WITH THE REACTIONMEMBER.